﻿考题：请问以下代码输出什么？ 为什么？
<script>
	function A() {
		var o = {};
		o.__proto__ = A.prototype;
		o.money = "99万";
		A.prototype = {
			age: 19
		};
		return o;
	}
	var a = A();
	document.writeln(a.age);
	var b = A();
	document.writeln(b.age);
</script>